Grease gun



Sept.- 1, 1931 R. RAPELLIN 1,821,404 GREASE GUN.- Filed June 3o, 19:50'

INVENTOR I3V 13 g RENE RAPELLIN ATTORNEYS i Patented Sept. 1931 PATENTori-ICE REN RAIPELLIN, F SAN GABRIEL, CALIFORNIA GREASE GUNApplica/calmed :rune ao, 1930. serial No. 464,875. "i

My invention pertains to a grease gun or similar article in which aplunger or a piston is operated to expel the grease and is retracted todraw the grease into the gun. My 5,invention pertains to a quick releasefor the stem or plunger operating the piston after expelling the greaseto enable a quick refilling of the grease gun.

A particular object Vand feature of my invention is in a grease gun inwhich the piston or plunger is operated by a screw threaded stem orspindle operating through a'nut-like structure to expel the grease by amovement of the plunger toward the outlet end of the gun, which isopposite the nut, and such nut is of a quick release type so thatthescrew threaded stem 'or spindle may be released from the nut afterexpelling the grease, and the ste-m or spindle retracted by a directpulling action, and by such pulling action Vgrease may be sucked intothe discharge end of the gun after removing a closure head at suchdischarge end.

Another detailed obj ect and feature of invention is constructing thegrease gun of aA tube with a removable head with an opening therethroughfor the ste-m. This closure head is provided with a transverse slidewayin which is lmounted'a split nut, which nut is constructed in two halveswith lateral extensions which are engaged by a right and left handedscrew. Such screw has a mounting v which prevents its longitudinalmovement and is provided with a spindle extending laterally through thetubular wall of the grease' gun adj acentthe head so that bymanipulating the spindle operated by a linger actuated nut, the nut maybe engaged with the threads of the stem operating the plunger or piston,or disengaged therefrom.

My invention is illustrated in connection with the accompanying drawingsin which Fig. 1 is a side elevation of the grease gun.

Fig'. 2 is a longitudinal section taken on kthe line 2-2 of Fig. 3.

Fig. 3 is a transverse section on the line 33 of Fig. 1 in the directionof the arrows, showing the nut in its closed position.V d

Fig. 4 is a view similar to Fig. 3 showing 5o the nut in itsopenposition.

Fig. 5 is a horizontal section on the line 5 5 of Fig. 2 taken in thedirection of the arrows. p l

`Fig.'6 is a perspective View of the guideway forthe split nut and oneof the halves of si the nut. d 'p In myinvention I employ a grease gunbarrel 11 which is indicated as having a collar 12 with projecting lugs13 vshrunkthereon to give a hand grip in holding the barrel of thegun.4The discharge end of the barrel has a closure head 13 with an outletduct 14 and is provided with a washer 15 having an aperture 16 inalignmentwith the duct 14. This closure head has a flange 17 which isscrew 65 threaded to the end of the barrel', and has lugs 18 tofacilitate gripping for unscrewing the closure head.

The vopposite end ofv the barrel is provided with a head 19 which has aslip connec- 70 tion in the end of the barrel and is held therein byscrews 20 extending through the barrel into lugs or the like in the head19. This head is provided with a ferrule 21 having an enlarged opening22 for the passage of a screw 75 threaded stem or spindle 23. Thislatter has a piston or plunger 24 swivelly connected to the lower end asis the usual practice in grease guns, and at the outer end the stem hasan l operating handle 25 to facilitate the rotation 8O of the stem.

The head 19 has a disk-like top section 26, and at one side anddepending therefrom there is a first bracket 27 having a radial pardtition 28 with a perforation 29 therethrough. 85 Also depending from thedisk 26 there is a second bracket 30 which has a finished, vertical face31 parallel to avdiameter of the barrel of the grease gun and parallelto the axis of the perforation 29. The bracket 30 90 has a pair oflateral lugs 32, each having one of the screws 20, and there is a thirdscrew which extends into the bracket 27, preferably opposite thepartition 28. Ther-e is a bottom plate 33 secured by screws 34 to thebracket 30, having an enlarged opening 35 through the center, which isfor the stem 23. This plate, with the face 31 and the bottoml of thedisk 26, forms a guideway or slide ytrack for 13B engage right and: left'hand threads on a spindle al, which spindle has a cylindrical sectionAi2 which is journaled in the perforation The spindle has afinger-operated head 43 and is preferably assembled in the bracket 2T byhaving screw threads adjacent the head 43 threaded through one of thehalf nuts and the spindle iittingin-the perforation 29. The other headis preferably made in the form of'a tube which may be slipped on thespindle and threaded through the other part of the half nut and thensoldered` or welded to the spindle. The spindle extends 'outwardlythrough a slot 4A in the upper end of the barrel 11. y

The manner of operation ot' the device is as follows: Y y

After the piston or plunger 24' has been operated by rotating the handleand thus rotating the stem 23 through the split nut until the grease isdischarged through the duct or passage la in the closure head V13, thenthe grease gun" can be refilled by unthreading the closure head' 13 andinserting the open end of the barrel' ll in a pot of grease. The spindle41 may then be rotated to slide the twohalves 37 of the split nutoutwardly due tothe right andll'eft handL threads on this spindle, Vandsuch spindle is main-- tained from longitudinal movement by the centerlportion 42 engaging in the perforation 29 of the partition 28-o'fth'ehracket2T Vlien the split nut is spread. apart it occupies theposition shown in Fig, 4L 'The stem`23with the piston 24 may then bepu'llzed'upwardly, in the gun barrel by pulling on the handle, 25 andthus suck grease into the open lower endV of the barrel until the pistoncomes in` contact with the plate 33'` attached; to the bracket 30.Rotating the stem Lil in the opposite direction then clamps the splitnut' on the operating spindle 23, and after. replace-Y mentv of theclosure head 13 grease may again be expelled by rotating the handle 25andA the stem 23.

Various changes maybe made in the" details of construction withoutdeparting from the spirit or scope of the invent-ion as defined by theappended claims.

I claim:

l. In a grease gunhaving a-s'crew threadedstem with apistonconnectedrthereto, a splitl nut, a spindle having a screwAthreaded connection to the parts of said nut, said spindle. extendingoutwardly throughthe sides ofthe` 2. In a grease gun having a tubularbarrel with a screw threaded stem extending therein and having a piston,a head on one end of the barrel having an opening for the stem, a splitnut having parts slidably mounted in the said head with a spindle havingright and left hand threads engagingy the parts of theV nut,saidispindle extending outwardly through the barrel, the rotation of thespindle shifting the parts of the nut to clamp or releasezthe saitdstem..

3. In a grease gun having a tubular barrel, a closure head at one end ofthe barrel formed of adisk with an opening therethrough, a screw"threaderl stein extending through said opening andV having' a piston onthe inner end, a splitnuthaving two separable parts slidably mountedIin4 the said disk, a transverse spindle havingnfightand left threadsextending through the barrel, the rotation of the spindle shiftingtheparts of the split nut 'transverselyl to clamp or release the stem'.

1. In a grease gun having a tubular barrel with a. closure head in theformof a disk having an opening, with a screw threaded stein extendingthrough the opening, a pistonon. the Vnner end of the stem, a bracket"depending'. fronr the disk and having a partitionfwith a perforationlconnectedl thereto, a transverse spindle extending through theperforation andl having right and. left screw threads on opposite sidesof said partition, and a split nut having two parts each engaged by oneof the threads onthe spindle, the rotationof the spindle shifting theparts ofthe nut to clamp or release thel said stem.

5. In a grease gun having a tubular barrel with a head at one endformed, of a disk with an opening therethrough, a first bracketdepending from the disk and having a connection to the barrel, a secondbracket dependingA from the disk andV also having connections tothebarrel, the said second bracket having guide surfaces, a split nuthaving two the firstv bracket having atra nsverse partitionv with*v aperforation, the saidspindle extending through the perforation andhaving the right and left hand-threads on opposite sides of saidjpartition, y l

Inra grease gunhaving a tubular barrel, a head at oneend having adisk-like closure structure at the end ofthe barrel with' an openingtherethrough, a screw threaded stem extending through the opening and'`having a pistoniinl the barrel, a `first bracket on the disk havingatransverse partition with'. a perforation therethrough, asecond bracket'depending from the disk and having a lat bearing surface, means toattach the barrel to the said brackets, a split nut having tWo partsbearing and guided on the said surface and having lateral extensions, aspindle extending Y through the said perforation having reverse threadson opposite sides thereof engaging the said extensions of the nut, thespindle eX- tending transversely through an opening in the barrel andhaving means to operate said spindle to clamp or release the said stem.

In testimony whereof I have signed my name to this specication.

REN RAPELLIN.

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